The molecular action of ultra violet light is mainly reflected through
A
Photodynamic action
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B
Destruction of hydrogen bonds between DNA strands
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C
Formation of pyridine
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D
Destruction of ester bonds
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Solution
The correct option is B Destruction of hydrogen bonds between DNA strands UV rays are highly injurious to living organisms since DNA and proteins of living organisms preferentially absorb UV rays, and its high energy breaks the chemical bonds of hydrogen within these molecules. UV-B damages DNA and mutation may occur. It causes ageing of the skin, damage to skin cells and various types of skin cancers.